Table 5.

Multivariable Analysis of Outcomes Among Women Gaining Below the Institute of Medicine Guidelines^*

	Underweight OR (95% CI)	Normal weight OR (95% CI)	Overweight OR (95% CI)	Obese OR (95% CI)
Gestational hypertension	0.6 (0.2–1.5)	0.7 (0.5–1.1)	0.7 (0.4–1.4)	0.7 (0.5–1.2)
Preeclampsia	2.5 (0.5–11.5)	1.3 (0.7–2.5)	1.0 (0.2–4.4)	1.1 (0.5–2.3)
Cesarean delivery	0.4 (0.2–1.1)	0.9 (0.7–1.3)	0.7 (0.4–1.4)	0.9 (0.6–1.3)
Indicated preterm birth	1.2 (0.2–8.0)	1.2 (0.5–2.7)	1.4 (0.4–5.4)	0.9 (0.4–2.4)
Spontaneous preterm birth	1.2 (0.5–3.1)	2.0 (1.3–3.2)	1.0 (0.4–2.5)	1.8 (0.7–4.2)
Small for gestational age†	1.6 (0.8–3.4)	1.3 (1.0–1.8)	0.7 (0.4–1.4)	1.7 (1.1–2.8)
Large for gestational age‡	0.5 (0.1–2.6)	0.5 (0.3–0.8)	0.4 (0.1–1.6)	0.8 (0.3–2.2)

OR, odds ratio; CI, confidence interval.

^*Adjusted for maternal age, race, treatment group and smoking. Referent group: women gaining within the guidelines.

^†Small for gestational age defined as birth weight below the 10^th percentile.

^‡Large for gestational age defined as birth weight at or above the 90th percentile.